var createError = require('http-errors');
var express = require('express');
var path = require('path');
var logger = require('morgan');

var bodyParser = require('body-parser');
var cookieParser = require('cookie-parser');
var session = require('express-session');
var mongoStore = require('connect-mongo')(session);

var DB_URL = 'mongodb://127.0.0.1:27017';

var api = require('./api/api');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views/pages'));
app.set('view engine', 'pug');

app.use(logger('dev'));
app.use(express.json());
app.use(bodyParser.json());  
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(session({
  secret: 'blog',
  // session 持久化 存入MongoDB, 默认存在内存中
  store: new mongoStore({
    url: DB_URL,
    connection: 'session'
  }),
  resave: false,
  saveUninitialized: true,
  cookie: {maxAge: 24*60*60*1000}
}));

app.use(express.static(path.join(__dirname, 'public')));

app.use('/', api);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
